Patents by Inventor Isao Mutai

Isao Mutai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Thickness shear crystal resonator and manufacturing method therefor
    Patent number: 5283496
    Abstract: A thickness, shear crystal resonator and a method of manufacturing therefor in which a natural crystal surface is appeared on at least a part of surfaces of crystal plate thereof to the extent that the part is made substantially transparent, the impedance of the crystal resonator is made small thereby and a large Q factor can be obtained. And, there is found no dip in the temperature characteristics of the impedance and the vibrating frequency of the crystal resonator.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: February 1, 1994
    Assignee: Asahi Dempa Co., Ltd.
    Inventors: Hitoaki Hayashi, Isao Mutai